highaltitude.log.20080224

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[01:27] <Laurenceb> can anyone get the ukhas site to load?
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[09:03] <Hiena> ' morning!
[09:03] <Laurenceb> hello
[09:04] <Laurenceb> http://imagebin.org/14270
[09:05] <Laurenceb> gnuplot is a pain
[09:09] <Laurenceb> I need to stick in a temperature sensor to measure the air temp
[09:09] <Laurenceb> or my flow wont be know
[09:19] <Hiena> Ugh... Why not using an temperature compensated pressure sensor and reading it's datas?
[09:21] <Hiena> Using with the GPS datas, you could calculate the other fluid parameters.
[09:30] <Laurenceb> no, this is the differential pressure across my filter
[09:31] <Laurenceb> using the porosity and viscosity relation
[09:31] <Laurenceb> as the air temperature changes
[09:31] <Laurenceb> I'm using this to control the flow rate through the experiement
[09:31] <Laurenceb> which needs to be know to high accuracy
[09:36] <Hiena> I see. How about using differential pressure sensor?
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[09:37] <Laurenceb> I am
[09:37] <Laurenceb> its across the filter
[09:37] <Laurenceb> but the air viscosity changes with temperature
[09:38] <Laurenceb> http://wiki.ukhas.org.uk/projects:aerosol_code
[09:38] <Laurenceb> almost done :p
[09:40] <Laurenceb> just need to add the cutdown scripts
[09:43] <Hiena> Well. I have to start coding too. Yesterday, i made the image sequence ellipsefinder, now i have to extract the datas.
[09:44] <Hiena> Be back later.
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[09:57] <Laurenceb> hey edmoore
[09:57] <edmoore> morning laurenceb
[09:57] <Laurenceb> http://wiki.ukhas.org.uk/projects:aerosol_code
[09:57] <Laurenceb> first draft is ready :P
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[10:02] <Laurenceb> looks like I'm going to need a temperature sensor on the air filter
[10:02] <Laurenceb> the viscousily varies too much
[10:02] <Laurenceb> arrg my spelling :(
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[11:23] <Hiena> Holy bubbles and melted cables... I need higher output woltage for the gas generator. 200V isn't enough. The DC/AC converter pulls 30 A at 12V.
[11:26] <Hiena> And this is still not the resonant version.
[11:27] <Laurenceb> gas?
[11:27] <Laurenceb> hydrogen?
[11:30] <Laurenceb> I've tried hydrogen with a PC power supply, and decided I needed too much power
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[11:40] <Hiena> Well, the key is not using clear water. The ionised solutions requires less energy. The another key is the high voltage. When low voltage used the most of the energy is lost due the resistance of the water. And at last key is the surface. On the small surfaces the bubble builds-up works as the insulator. On the small surface reactors the best way is stirring the water.
[11:40] <Laurenceb> ah ineresting
[11:41] <Laurenceb> I didnt think of the last point
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[11:44] <Hiena> Also using different metals as electrodes will increase the gas generation. It's linked by the electropotencial. I usually using a aluminium and copper electrodes. This settings produce two times gas as the two aluminium electrodes.
[11:45] <Laurenceb> interesting
[11:48] <Hiena> Well, here is no cheap helium resources. So i use what i could obtain. Hydrogen, methane, nitrogen...
[11:49] <Laurenceb> bbl
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[12:21] <mc-> Laurenceb?
[12:22] <Laurenceb> hey there
[12:23] <Laurenceb> how are you?
[12:23] <Laurenceb> mc- ?
[12:25] <mc-> hi
[12:25] <mc-> was elsewhere
[12:26] <mc-> just wondering if you have any spare thermopiles
[12:26] <Laurenceb> nope
[12:26] <mc-> I think I ordered 4 for my stuff
[12:26] <mc-> oh
[12:26] <Laurenceb> there are some with edmoore, and some with rocketboy
[12:26] <mc-> ok, I'll ask them.
[12:26] <mc-> thanks
[12:27] <Laurenceb> I think edmoore has the spare ones
[12:27] <Laurenceb> sorry for the confusion
[12:27] <mc-> ok, btw I've got my 50MHz transceiver now, so I working on a steerable chute
[12:27] <mc-> controlled from the ground
[12:27] <Laurenceb> I think I emailed you about it back then
[12:27] <Laurenceb> nice
[12:27] <Laurenceb> but is it legal?
[12:27] <mc-> yes, I've got a ham license
[12:27] <Laurenceb> I thought we could only use 434 MHz ?
[12:27] <Laurenceb> ah cool
[12:28] <Laurenceb> I'm going to turn my rogallo into a UAV
[12:28] <mc-> only can transmit 434 from the balloon
[12:28] <Laurenceb> I'm working on this at the moment - http://wiki.ukhas.org.uk/projects:aerosol
[12:28] <Laurenceb> hopefully it will be almost finished by the end of this comingweek
[12:29] <mc-> I saw, you were asking about an opamp filter
[12:29] <Laurenceb> yes
[12:29] <mc-> there's a microchip freeware to design opamp filters
[12:29] <Laurenceb> theres an annoying issue with the pressure sensor
[12:29] <Laurenceb> ok
[12:29] <mc-> you need something like a Cheby or Elliptic filter to get a good cutoff.
[12:29] <Laurenceb> right
[12:30] <Laurenceb> yes, it needs a tight cutoff
[12:30] <mc-> or else can you subtract the interfering signal from the main signal?
[12:30] <Laurenceb> no, its not really a signal
[12:30] <Laurenceb> its real
[12:30] <Laurenceb> due to the rotor in the pump
[12:31] <mc-> can you see the pump signal?
[12:31] <Laurenceb> what do you mean?
[12:31] <Laurenceb> its a 40hz sinusoid
[12:31] <Laurenceb> I want to know the mean voltage
[12:31] <mc-> so you may be able to invert the 40Hz, and subtract from the signal, to get the wanted signal
[12:32] <Laurenceb> yes
[12:32] <Laurenceb> but thats too tricky
[12:32] <mc-> is it always at 40Hz?
[12:32] <Laurenceb> no
[12:32] <mc-> a notch filter would work
[12:33] <Laurenceb> I'm sure it can be fixed, but the annoying thing is I have to take all the plumping apart to get at the filter board
[12:33] <Laurenceb> oh well
[12:34] <mc-> did you test the thermopiles on your rogallo?
[12:34] <Laurenceb> no
[12:34] <Laurenceb> there werent any
[12:35] <mc-> the roll axis was passively stable?
[12:35] <Laurenceb> yes
[12:35] <Laurenceb> thats the point of a rogallo :p
[12:36] <mc-> good to hear that, I wanted to just control the direction of a chute.
[12:36] <mc-> and didn't want have to worry about stability
[12:36] <Laurenceb> look at my code
[12:36] <Laurenceb> for the rogallo
[12:36] <mc-> it's easier to ask you a question though..
[12:37] <Laurenceb> http://wiki.ukhas.org.uk/projects:ukhas_glider_project:methods_of_control
[12:37] <mc-> I want to send commands from the ground, so I need to know the GPS position, and heading.
[12:37] <Laurenceb> but I have to get some brunch :P
[12:37] <mc-> ok
[12:37] <Laurenceb> you can ask 1 question :P
[12:38] <mc-> nothing more to ask now..
[12:38] <Laurenceb> hehe nvm
[12:38] <Laurenceb> cya
[12:38] <mc-> cya
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[16:25] <msweeney> afternoon all
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[17:20] <Laurenceb> hey all
[17:20] <Laurenceb> hi phatmonkey
[17:24] <Laurenceb> phatmonkey: whats going on with the website? its been a bit flaky
[17:24] <phatmonkey> hey Laurenceb
[17:25] <phatmonkey> has it? what's gone wrong
[17:25] <Laurenceb> it seemed to have disappeared a couple of days ago
[17:25] <Laurenceb> for a while
[17:25] <phatmonkey> hmm, not sure
[17:26] <phatmonkey> maybe we should get proper hosting for it
[17:26] <Laurenceb> and it was being very sloooo
[17:26] <Laurenceb> have you changed the front page?
[17:26] <Laurenceb> the banner has moved
[17:26] <phatmonkey> nope
[17:26] <Laurenceb> odd
[17:26] <phatmonkey> looks fine to me
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[17:26] <Laurenceb> the wiki has moved to the right
[17:26] <Laurenceb> and the banner is now right aligned
[17:27] <Laurenceb> it was centered
[17:27] <phatmonkey> can you send me a screenshot?
[17:27] <phatmonkey> i removed the contact button, that's why the wiki link has moved
[17:28] <Laurenceb> http://imagebin.org/14284
[17:28] <Laurenceb> ah ok
[17:29] <Laurenceb> probably why
[17:29] <Laurenceb> I thought it had been hacked or something :P
[17:29] <Laurenceb> thats cool
[17:30] <Laurenceb> anyway, hows life?
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[17:31] <phatmonkey> yeah, that's what it's meant to look like
[17:31] <phatmonkey> life isn't bad!
[17:31] <Laurenceb> cool
[17:31] <phatmonkey> I think I've decided on doing engineering at warwick now
[17:31] <phatmonkey> so that's all changed a bit
[17:31] <phatmonkey> might take a gap year to reapply to oxford, but it's unlikely
[17:31] <phatmonkey> how's life?
[17:31] <Laurenceb> oh ight
[17:31] <Laurenceb> interesting choice
[17:32] <Laurenceb> I was planning on having a bit of time off next time
[17:33] <Laurenceb> year*
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[17:33] <Laurenceb> but I've applied for a phd studenship now, at surrey satellite technology
[17:34] <phatmonkey> ah nice
[17:34] <phatmonkey> I went for an open day at surrey
[17:34] <phatmonkey> they made a big deal about all the satellite stuff
[17:34] <Laurenceb> oh right, what dept?
[17:34] <phatmonkey> physics
[17:34] <Laurenceb> I see
[17:35] <Laurenceb> I'm working on the aerosol project at the moment, but I want to get back to the zagi when I've got time
[17:36] <Laurenceb> any chance you could try fine tuning the simcode you wrote a while back?
[17:36] <phatmonkey> well it wasn't really much
[17:36] <Laurenceb> if you could fine tune the feedback
[17:36] <phatmonkey> just a pid controller hooked up to a simulator really!
[17:37] <phatmonkey> ... the sim model was far from an accurate representation of the zagi unfortunately
[17:37] <Laurenceb> and try and work out the relationship between the control surface input and the control surface
[17:37] <Laurenceb> yes...
[17:37] <Laurenceb> the moment of inertia, size, and mass are important
[17:38] <Laurenceb> but it would still be interesting to look at the relative sizes of the constants
[17:38] <phatmonkey> ok, i'll have a look when i have some time
[17:39] <phatmonkey> but that's hard to come by at the moment
[17:39] <Laurenceb> doesnt matter
[17:39] <Laurenceb> I have to launch this next project
[17:39] <Laurenceb> before I can get back to it
[17:39] <phatmonkey> ok
[17:43] <Laurenceb> finished the first draft of the code today
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[17:55] <Laurenceb> haha http://en.wikipedia.org/wiki/First_Earth_Battalion
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[00:00] --- Mon Feb 25 2008